Improvement in hot-air furnaces



D. BBYD.

Hot-Air Furnaces.

Patented Aug. 11,1874.

THE GRAPH!!! COFHOYO -LI (.39 4! PARK PLACE, tLY.

UNITED STATES PATENT OFFI E.

DAVID BOYD, OF NEW YORK, N. Y.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 153,928, dated August11, 1874; application filed April 25, 1874.

To all whom it may concern:

Be it known that I, DAVID BOYD, of the city, county and State of NewYork, have invented a new and useful Improvement in Stoves andHeat-Radiators, of which the following is a specification:

In the accompanying drawing, Figure 1 represents a vertical section ofthe heater, showing the diaphragm and general arrangement of the parts.Fig. 2 is a horizontal section above the diaphragm. Fig. 3 is ahorizontal section through the base of the dome above the fire-chamber.

Similar letters of reference indicate corresponding parts.

This improved apparatus is designed for use both as a heater for theapartment in in which it may be located, and as a furnace for heatingother parts of the building to which. hot air may be conveniently oreconomically conveyed by pipes or tubes.

The features of novelty are hereinafter described generally, andindicated specifically in the claim.

The lower part of the heater is made up of domes B B B, fire-box J,ash-box K, inclosed in a casing, having openings 0 for discharge ofheated air. The air to be heated enters at z, traverses tubes H, andenters space 0, whence it escapes at E. The products of combustion passup through dome-space G into flue F. The upper part of the casing hasone or more openings, 0, or short tubes for escape of air. The uppercompartment is occupied by the concentric flue S, which communicateswith the flue F at the center of the compartment, and also at theperiphery or outside. The pivoted damper T is located in the flue Fbetween the inner and outer portion of flue S, to cause the products ofcombustion to take thecircuitous and return course indicated by arrowsin Fig. 2, or the direct one through passage F, thus, in large measure,controlling the degree of heat radiated by the heater, and also therapidity of combustion.

The air to be heated in the upper compartment enters apertures t" in theside of the casin g, and passes through it in contact with the flue F.

Having thus described my invention, I claim as new and desire to secureby Letters Patent In combination with the upper compartment of case N,the concentric flues S, inlet and discharge passage F, and damper T,thelatter being arranged to control the direction of the smoke-current, asshown and described.

DAVID BOYD.

Witnesses:

T. B. MosHER, ALEX. F. ROBERTS.

